Mycelium during cool down. All the photos show the 50/50 mixture.
Pinhead formation Sylvan A15. A few ink cap fungi can still be seen in this phase, but according to the grower they don’t cause any problems and soon disappear.
the UK. The tunnels were delivered to France in September 2022 and were operational by October, with a simple filling line and pulling winch for emptying. October 2022 saw the first delivery of the much more effectively hygienised material to Legro where it was mixed in a ratio of 70% Legro and 30% Cormo. The first batches used by a Ger- man customer did not cause any problems with either the quality or quantity of the mushrooms. In consultation, the mixing ratio was changed to 50/50. As of January 2023, four German compa- nies have joined the project for the new validation trials of the material. The results are generally satisfactory, with results similar to conventional casing soil. However, there are still some pro- blems, especially with plaster moulds that grow over the mixture and with the water balance too. In certain cases, a number of participants had lower yields. Notably, growers who use drier mixtures again seemed to be problem-free, while growers who use a wetter mixture incidentally see more “strange” moulds. According to Mat- thias Thaler, CEO of Cormo, there are various causes behind the problems. “Our material is not
peat, which has a low pH value and is therefore in principle disease-free. The Cormo mixture has a pH value higher than 7 so, over time, after it has been hygienised, fungi can start growing again in it. With a high turnover rate and when our mate- rial is used quickly, we hardly see any problems. However, if the material is stored for longer, other fungi, which by the way are quite harmless, do have an opportunity to grow again. The key- word here is hygiene, during treatment, transport and storage.
Experience “Based on the experience we gained, we took a different approach in 2023. Until now, we’ve had issues with a small number of shipments we’ve supplied to Legro. Firstly, because the material was stored for too long after the hygienisation process which caused the unwanted fungi on the casing soil. A while later, one of our tunnels got too warm. This probably made the mixture too sterile, so it became a good growth medium for all sorts of things. But generally, I’m very thankful that the BDC was willing to participate in this
First flush Sylvan A15.
Second flush Sylvan A15. MUSHROOM BUSINESS 17
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